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maandag 18 maart 2013

Sony A57 - Algemeen; SLT Design-principle and advantages (Engelstalig)

Traditional SLRs (which stands for Single Lens Reflex) had a mirror behind the lens that swung out of the way the moment you took the picture. The mirror was there to ensure that the composition you saw in the viewfinder was identical to what ended up on the film. And moving that mirror up and down five frames per second (or faster with some high-end sports cameras) is a mechanical engineering challenge which can also induce a lot of in-camera vibration.

But what if the mirror remained fixed in place? Or, more specifically, what if the mirror was a semi-transparent variety, which let most of the light through but reflected about one third of that light up to some autofocus sensors? 
That would solve two of the biggest problems with most other SLRs that try to shoot video: 
1) you would now be able to add fast autofocus while you’re shooting video, and 
2) you would be able to shoot many more frames-per-second (12 in the case of the A57) than what a consumer-grade moving mirror would normally be able to allow. AND you wouldn’t have to give up autofocus in this mode! The Single Lens Translucent (SLT) was conceived to give you a full-time Live View function with no compromises.

Another great advantage of this fixed mirror is that the dirt tends to stay on the mirror and never gets to the sensor. Yes, this is actually better for two reasons: 1) it’s much easier to clean dust off the mirror because it’s much easier to see, and 2) even with dust on your mirror you would not see dust spots on your pictures. 

Bron: Gary Friedman: the complete guide to sony A65

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